Wax stripper



w. A. TYNER WAX STRIPPER Filed Dec. 8. 1950 W; M p i Patented Oct. 11, 1932 UNITED s 'm'res PATENT; OFFICE V WILLIAM TYNER, OF INDIANAPOLIS, INDIANA.

WAX STRIPPER Application filed December 8; 11930. Serial No. 500,694.

My invention is concerned with wax-strippers, or devices employed in leather-sewing machines for stripping wax from the thread after the thread has passed through a bath of molten wax. I

It is the object of my invention to produce a stripper which will effectively strip all excess wax from the thread, which will not; leak, and which will permit the passage of knots or ine ualities in the thread. A, furthrough my wax-stripper as mounted on a wax-pot; Fig. 2 is a transverse section on the line 2-2 of Fig. 1; and Fig. 3 is a per spective view showing the two stripping" members in separate relation. 7

In leather-sewing machines, it is customary to pass the thread through a wax-pot containing a supply of molten wax. Usually, there is an upper wax-pot through which the thread passes downwardly and a lower waxpot through which the thread passes upwardly. Where the thread emerges from the waxpot, a wax-stripper is provided in order to strip excess wax from the thread.

In the drawing I have illustrated the upper wax-pot 10, the bottom of which is pro vided with a screw-threaded opening for' the reception of the stripper-body 11. The

stripper-body 11 has an axial bore extending completely through it, the lower end of this bore being screw-threaded for the reception of an adjustable plug 12. The upper end of the bore of the body 11 is constricted to pro-- vide a shoulder 13, the purpose of which will be brought out hereinafter. Within the bore of the two complementary stripping members 14;,-

er portions of .the

der-13. body 11 I locate 1 grooves 15 are bell-mouthed, as is clear from the adjacent faces of which are provided with alined longitudinally extending grooves 15 which, when'the members ltareplaced face .to face, form aahole that at least for a a portion of its length closely embraces the thread 16. In order to avoid excessive friction, it may bedesirable to enlarge the low- I grooves.l5, as indicated in Figs. 1 and 3. 1

Each of the stripping members 1 1 is formed with head 18 and a shank 19, the shanks 19 preferably being ofsuch a'length that they will extend through an axialhole in the bottom of the plug 12. A coil-spring 17 acts between the heads 18 of the members 14; and the-plug 12 tending to force the members 14; upwardly to hold the heads" 18 in engagement with the shoulder 13. 3 By-tapering' the outer 'surfaces'of the heads18 or the head-engaging surface of the shoulder 13, or both, I am enabled to employthe axial force exerted by the spring 17 to force the two stripping members together, I

As shown in the drawing, the heads 18 of --the stripping members are tapered to enter the hole through the shoulder 13, so that as the spring 17 tends to force the members 14 upwardly the shoulder 13 cams them inwardly toward each other in order that the surfaces of the grooves 15 are pressed into engagement with'the thread 16'.

-As indicated in'the' drawing, the lower face of the shoulder 13 is preferably also tapered for the purpose of guiding the upper ends of the stripping members into the hole in the shoulder 13. This tapering is conveniently greater than that of the outer surfaces of the heads 18, so that the heads will have substantially a line contact with the shoulder: I find this arrangementto be preferable to one in which the lower face of the shoulder and the outer surfaces of the heads 18 are coinplementarily tapered; as with the line-contact provided by the preferred arrangement, itis impossible for dirt or foreign matter to be retained between the engaging surfaces of the heads 18 and shoul- Conveniently, the upper ends of the which the spring 17 exerts on the stripping Fig. 3, in order to facilitate the entry of the thread into the grooves.

By adjusting the plug 12 in its screwthreaded mounting in the body 11, the force members 14 moves the heads 18 thereof out of engagement with'the shoulder 13 so that the stripping members may be spread apart 7 by the wedging action of the knot or enlargement in the bell-mouthed openings of the grooves 15 to permit the passage of the t-ion.

.knot or enlargement. Assoon as the knot has passed the narrowest portion of the groove 15, the spring 17 immediately forces the members upwardly to bring the heads 18'into contact with'the shoulder 13; whereupon the stripping means comprised by the members 14 is collapsed to embrace the thread tightly.

I have illustrated the stripper as applied to a wax-pot through which the 7 thread passes downwardly. It will be obvious, how-' ever, that the stripper can be mounted in the top. of a wax-pot through which the thread. passes upwardly; or, in general, that the stripper may be used in any desired loca- My stripper as above described will effectively strip all excess wax from the thread.

:It will perform this action without permitting the escape of wax from the wax-pot.

Further, by reason of the fact that longitudinal movement of the stripping members permits their separation, my stripper does not interfere with the passage of knots or inequalities which frequently are encountered Y in thread, and which, in prior strippers of which I am aware, frequently cause breakage of the thread.

I, claim as my invention:

1. A wax stripper for stripping wax from a moving thread, comprising a hollow body provided interiorly with a shoulder, a'pair of complementary stripping members having alined grooves in their mating recesses to receive a thread, said members also having conical surfaces adapted to engage said shoulder, and yielding means for forcing said members into engagement with said shoulder in a direction opposite to that inwhich the thread moves.

2. A wax stripper for stripping wax from "."a moving thread, comprising a hollow body providedinteriorly with a shoulder, a pair of complementary stripping members having alined grooves in their mating recesses to receive a thread, said members also having conical surfaces adapted to engage said shoulder, a coil compression spring for forcing said members into engagement with said shoulder in a direction opposite to that in which the thread moves, said members having shanksreceived within said spring, and an axially adjustable plug mounted in said body and adapted toserve as an abutment for said spring, said plug having an opening for slidably receiving said shanks. V 3. A wax stripper for stripping wax from a moving thread, comprising a hollow body provided interiorly with a shoulder, a vpair of complementary stripping members having alined grooves in their mating recesses to receive a thread, said members. also having conical surfaces adapted to engage said shoulder, a coil compression spring for forcing said members into engagement with said shoulder in a direction opposite to that in which the thread moves, said members having shanks received within saidspring, and an axially adjustable plug mounted in said body and adapted to serve as an abutment for said spring.

4. A wax stripper for stripping wax from a movingthread, comprising a hollow body provided interiorly with a shoulder, a pair of complementary strippingmembers having alined grooves in their mating recesses to receive a thread, said members also having conical surfaces adapted to engage said shoulder, a coil compression spring for forcing said members into engagement with said shoulder in a direction opposite to that in which the thread moves, said members having shanks received within said spring, and said body being provided with an abutment for said spring.

5. A wax stripper for stripping wax from a moving thread, comprising a hollow body provided interiorly with a shoulder, apair of complementary stripping members havingalined grooves in their mating recesses to receive a thread, said members also having conical surfaces adapted to engage said shoulder, a coil compression spring for forcing said members into engagement with said shoulder in a direction opposite to that in which the thread moves, and said body being provided with an abutment for said spring.

6. A wax stripper for stripping wax from a moving thread,fcomprising a'hollow body provided interiorly. with a shoulder, a pair of complementary stripping members having alined grooves in their mating recesses to receive a thread, said members also having conical surfaces adapted to engage said shoulder, said shoulder having adjacent said members a conical surface of greater taper than the conical surfaces of saidzmembers, and

yielding means forforcing said members in- 1 0 20 engagement with said shoulder in a direction opposite to that in which the thread moves.

7. A wax stripper for stripping wax from a moving thread, comprising a body, two stripping members associated with said body, said members being provided in their adjacent faces with alined grooves adapted to receive the thread, yielding means acting on said members and tending to move them in a direction opposite to that of thread movement, and provisions for causing said two members to be forced toward each other as they are moved by said yielding means and for permitting said two members to move away from each other should they move with said thread in opposition to said yielding means.

8. A wax stripper for stripping wax from a moving thread, comprising a body, collapsible stripping means associated with said body and adapted to embrace said thread, said stripping means being longitudinally movable in said body, yielding means tending to move said stripping means in the direction opposite to that of thread movement, and provisions for causing said stripping means to collapse to grip said thread as the stripping means is moved by said yielding means and for permitting said stripping means to expand to release said thread should the stripping means move with the thread against said yielding means.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 5th day of December, A. D. one thousand nine hundred and thirty.

WILLIAM A. TYNER. 

